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561 ECU failure 200 1989

posted by  rstarkie on  Fri Apr 11 08:47 CST 2003
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last visit: Fri Oct 24 10:14 CST 2014
[RELATED]

I had a no start situation in one of our 89 240's. Substituting a known good fuel pump relay didn't help. Jumping fuse 4 to 6 caused the pump to run and the car to start. Substituting a 951 ECU from a running parts car cured the problem.

Can anyone share their 561 failure story? I'm wondering if this is the typical failure most people experience. I've been told the common failure results in a loss of ground to the fuel pump relay. Does jumping fuse 4 to fuse 6 provide that ground or am I just eliminating the fuel pump relay altogether when I jump the fuses? (I am electrically challenged) Thanks for any input.

It would seem that besides a resoldered fuelpump relay it might be a good idea to carry a short jumper wire with alligator clips for a quick "get me home" fix. Especailly if you are still running a 561 ECU. BTW mine failed at 162,000 miles.

Randy






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